Moving Pattern to static constant

pmd-apex/src/main/java/net/sourceforge/pmd/lang/apex/rule/security/ApexCRUDViolationRule.java

@@ -57,6 +57,8 @@ import com.google.common.collect.ListMultimap;
  */
 public class ApexCRUDViolationRule extends AbstractApexRule {
     private static final Pattern VOID_OR_STRING_PATTERN = Pattern.compile("^(string|void)$", Pattern.CASE_INSENSITIVE);
+    private static final Pattern SELECT_FROM_PATTERN = Pattern.compile("^[\\S|\\s]+?FROM[\\s]+?(\\S+)",
+            Pattern.CASE_INSENSITIVE);
 
     private final HashMap<String, String> varToTypeMapping = new HashMap<>();
     private final ListMultimap<String, String> typeToDMLOperationMapping = ArrayListMultimap.create();
@@ -543,7 +545,7 @@ public class ApexCRUDViolationRule extends AbstractApexRule {
     private String getTypeFromSOQLQuery(final ASTSoqlExpression node) {
         final String canonQuery = node.getNode().getCanonicalQuery();
 
-        Matcher m = Pattern.compile("^[\\S|\\s]+?FROM[\\s]+?(\\S+)", Pattern.CASE_INSENSITIVE).matcher(canonQuery);
+        Matcher m = SELECT_FROM_PATTERN.matcher(canonQuery);
         while (m.find()) {
             return new StringBuffer().append(node.getNode().getDefiningType().getApexName()).append(":")
                     .append(m.group(1)).toString();